public byte[] Extract(bool Preview, String outname = null)
{
byte[] databuff;
int dataoff = 30;
if (Filename != null)
dataoff += Filename.Length;
if (Extra != null)
dataoff += Extra.Length;
using (FileStream tpf = new FileStream(_par._filename, FileMode.Open, FileAccess.Read))
{
tpf.Seek(FileOffset, SeekOrigin.Begin);
databuff = ZipReader.BuffXOR(tpf, dataoff + (int)ComprSize + 16); // XOR the whole data block as well as the footer
}
// Check for correct header data and such
ZipEntry fileentry = new ZipEntry(databuff);
if (!fileentry.Compare(this))
throw new InvalidDataException("File header not as expected");
if (BitConverter.ToUInt32(databuff, (int)ComprSize + dataoff) != datadescriptormagic)
throw new InvalidDataException("Footer not as expected");
//ZipCrypto.DecryptData(this, databuff, dataoff, (int)ComprSize);
KFreonZipCrypto crypto = new KFreonZipCrypto(this, databuff, dataoff, (int)ComprSize);
databuff = crypto.GetBlocks();
databuff = Deflate(databuff, 12 + dataoff, (int)ComprSize - 12);
if (databuff.Length != UncomprSize)
throw new InvalidDataException("Deflation resulted in incorrect file size");
CRC32 crcgen = new CRC32();
if (crcgen.BlockChecksum(databuff, 0, (int)UncomprSize) != CRC)
throw new InvalidDataException("Checksums don't match");
if (!Preview)
{
outname = outname ?? Filename;
using (FileStream fs = new FileStream(outname, FileMode.Create, FileAccess.Write))
{
fs.Write(databuff, 0, (int)UncomprSize);
}
return null;
}
else
return databuff;
}
public byte[] Extract(bool Preview, String outname = null)
{
byte[] databuff;
int dataoff = 30;
if (Filename != null)
{
dataoff += Filename.Length;
}
if (Extra != null)
{
dataoff += Extra.Length;
}
using (FileStream tpf = new FileStream(_par._filename, FileMode.Open, FileAccess.Read))
{
tpf.Seek(FileOffset, SeekOrigin.Begin);
databuff = ZipReader.BuffXOR(tpf, dataoff + (int)ComprSize + 16); // XOR the whole data block as well as the footer
}
// Check for correct header data and such
ZipEntry fileentry = new ZipEntry(databuff);
if (!fileentry.Compare(this))
{
throw new InvalidDataException("File header not as expected");
}
if (BitConverter.ToUInt32(databuff, (int)ComprSize + dataoff) != datadescriptormagic)
{
throw new InvalidDataException("Footer not as expected");
}
//ZipCrypto.DecryptData(this, databuff, dataoff, (int)ComprSize);
KFreonZipCrypto crypto = new KFreonZipCrypto(this, databuff, dataoff, (int)ComprSize);
databuff = crypto.GetBlocks();
databuff = Deflate(databuff, 12 + dataoff, (int)ComprSize - 12);
if (databuff.Length != UncomprSize)
{
throw new InvalidDataException("Deflation resulted in incorrect file size");
}
CRC32 crcgen = new CRC32();
if (crcgen.BlockChecksum(databuff, 0, (int)UncomprSize) != CRC)
{
throw new InvalidDataException("Checksums don't match");
}
if (!Preview)
{
outname = outname ?? Filename;
using (FileStream fs = new FileStream(outname, FileMode.Create, FileAccess.Write))
{
fs.Write(databuff, 0, (int)UncomprSize);
}
return(null);
}
else
{
return(databuff);
}
}
